Re: Rootfs mounted from user space - problem with umount

[John Zielinski <grim@undead.cc>]

William Lee Irwin III wrote:

>Looks like either namespace->sem or sb->s_umount; you should be able
>to put some instrumentation code in down_write() and/or down_read() to
>see who acquired it first by checking to see if the sem acquired belongs
>to rootfs' sb or some namespace (doubtful you'll create many of them).
>
>
>  
>

Found it.  It was a stupid mistake.  I made the get_sb function return 
the same superblock when it was still get_sb_nodev.  When I switched it 
to the proper get_sb_single I forgot to remove the code that returned 
the old sb so it wasn't calling get_sb_single to increase the sb's usage 
count.  Doh!

John